Streams, normally flow through wetlands before they reach a lake or a river.

　　溪流通常在到達(dá)湖泊或河流之前先流過濕地。

　　If people convert the wetlands to farmland, birds will not have enough space to live.

　　如果人們將濕地轉(zhuǎn)化為農(nóng)田，鳥類就沒有足夠的生存空間。

　　Wetlands have a big effect on groundwater, the amount of water below the surface of the land.

　　濕地對地下水，即地表以下的水量影響很大。

　　You can't grow oranges in wetlands, so farmers had to transform the wetlands into land suitable for farming.

　　你不能在濕地種植柑橘，所以農(nóng)民不得不把濕地變成適合耕種的土地。